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7.4
Sensor Loop 1 Configuration
Sensor Loop 1 can be used for applications other than a fire point. This sensor loop cannot be used for point
doubling and must be terminated with a 2.21 k Ω EOL resistor (P/N: 25899).
Loop resistance limits the number of Normally-Open and/or Normally-Closed detection devices that each sensor
loop can supervise. The total resistance for wire length and contacts, minus the end-of-line resistor, must not
exceed 100 Ω.
L1
+
-
7.5
Single Point Configuration (Points 2-8)
When wiring the on-board sensor loops in the single point configuration, install the resistor of the appropriate
value (2.2 k Ω and 3.65 k Ω are provided) at the far end of the sensor loop to provide a reference for
supervision. You can connect dry contact sensing devices in series (normally-closed) and/or in parallel
(normally-open) to any of these loops (see Figure 12).
L2 to L8
POINT INPUT
TERMINAL
COMMON
POINT INPUT
TERMINAL
COMMON
© 2002 Radionics
JP2-PO1
Select
R
Y
G
B
Aux (+)
Aux (-)
D285/D285TH w/
D292 Base
D275
End-of-Line Module
Figure 10: Typical Four-Wire Smoke Detector Wiring
100 OHMS MAXIMUM
COMBINATION: NORMALLY OPEN CONTACTS
AND NORMALLY CLOSED CONTACTS
Figure 11: Sensor Loop 1 Wiring
100 OHMS MAXIMUM
NORMALLY OPEN CONTACTS
COMBINATION: NORMALLY OPEN CONTACTS
AND NORMALLY CLOSED CONTACTS
Figure 12: Single Point Sensor Loop Wiring
D6412/D4412 Installation Guide
Page 29
Onboard Sensor Loops
Remove
Jumper Plug
from JP2
Alrm
PO1
-
+
A
B
L-1
+
Smoke
Detector
2.21 k
EOL
Resistor
EOL Relay
2.21 k Ω EOL Resistor
(P/N: 25899)
D6412/D4412
2.2 k Ω
EOL Resistor P/N: 47819
45349D
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